Thermodynamic assessment of high-temperature heat pumps using low-GWP HFO refrigerants for heat recovery

Chieko Kondou, Shigeru Koyama

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    71 Citations (Scopus)


    Abstract Reducing energy consumption by utilizing heat recovery systems has become increasingly important in industry. This paper presents an exploratory assessment of heat pump type heat recovery systems using environmentally friendly refrigerants. The coefficient of performance (COP) of 4 cycle configurations used to raise the temperature of heat media to 160 °C with a waste heat at 80 °C is calculated and compared for refrigerants R717, R365mfc, R1234ze(E), and R1234ze(Z). A multiple-stage "extraction" cycle drastically reduces the throttling loss and exergy loss in the condensers, resulting in the highest COP for R1234ze(Z). A cascade cycle using R1234ze(Z) and R365mfc has a relatively high COP and provides practical benefits. Even under adverse conditions, the primary energy efficiency is greater than 1.3 when the transmission end efficiency of the electric power generation is 0.37. The assessment demonstrated that high-temperature heat pumps are a promising approach for reducing primary energy consumption for industrial applications.

    Original languageEnglish
    Article number2884
    Pages (from-to)126-141
    Number of pages16
    JournalInternational Journal of Refrigeration
    Publication statusPublished - May 2015

    All Science Journal Classification (ASJC) codes

    • Building and Construction
    • Mechanical Engineering


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